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  Table 1. Drugs that impair neuromuscular transmission and may increase weakness in patients with underlying neuromuscular junction disorders

Antibiotics
Aminoglycosides
tobramycin
gentamicin
netilmicin
neomycin
streptomycin
kanamycin
Fluoroquinolones
ciprofloxacin
norfloxacin
ofloxacin
Ketolides
telithromycin (Ketek)
Other antibiotics
tetracyclines
sulfonamides
penicillins
amino acid antibiotics
macrolides
azithromycin
clarithromycin

Table 2. Drugs implicated as potentially harmful in myasthenia gravis patients based on either anecdotal case reports or in-vitro microelectrode studies (or both)

Beta blockers
propranolol
oxprenolol
timolol
practolol
atenolol
labetalol
metoprolol
nadolol
  Calcium channel blockers
verapamil
Other cardiac drugs
procainamide
bretylium
trimethaphan
Anticonvulsant medication
phenytoin
barbiturates
ethosuximide
carbamazepine
gabapentin
Ophthalmologic medications
timolol
betaxolol hydrochloride.
echothiophate (a long-acting cholinesterase inhibitor used in the treatment of open angle glaucoma)
Psychiatric drugs
lithium carbonate
phenothiazines
amitriptyline
imipramine
amphetamines
haloperidol
Other drugs prescribed by neurologists
riluzole
glatiramer acetate
Miscellaneous Drugs
fludarabine
cisplatin
interleukin-2